refactor: use base constructor and fix comments

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/flatten-by/docs/types/test.ts

@@ -149,7 +149,7 @@ function identity( x: any ): any {
 	flattenBy( x, [ 1 ], identity, {} ); // $ExpectError
 }
 
-// The compiler throws an error if the function is provided a second argument with invalid `depth` option...
+// The compiler throws an error if the function is provided a second argument with an invalid `depth` option...
 {
 	const x = zeros( 'generic', [ 2, 2, 2 ], 'row-major' );
 
@@ -166,7 +166,7 @@ function identity( x: any ): any {
 	flattenBy( x, { 'depth': [ 1 ] }, identity, {} ); // $ExpectError
 }
 
-// The compiler throws an error if the function is provided a second argument with invalid `order` option...
+// The compiler throws an error if the function is provided a second argument with an invalid `order` option...
 {
 	const x = zeros( 'generic', [ 2, 2, 2 ], 'row-major' );
 
@@ -183,7 +183,7 @@ function identity( x: any ): any {
 	flattenBy( x, { 'order': [ 1 ] }, identity, {} ); // $ExpectError
 }
 
-// The compiler throws an error if the function is provided a second argument with invalid `dtype` option...
+// The compiler throws an error if the function is provided a second argument with an invalid `dtype` option...
 {
 	const x = zeros( 'generic', [ 2, 2, 2 ], 'row-major' );
 

lib/node_modules/@stdlib/ndarray/flatten-by/lib/main.js

@@ -35,8 +35,8 @@ var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
 var strides2order = require( '@stdlib/ndarray/base/strides2order' );
 var flattenShape = require( '@stdlib/ndarray/base/flatten-shape' );
 var map = require( '@stdlib/ndarray/base/map' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
 var emptyLike = require( '@stdlib/ndarray/empty-like' );
-var ndarray = require( '@stdlib/ndarray/ctor' );
 var format = require( '@stdlib/string/format' );
 
 
@@ -179,12 +179,13 @@ function flattenBy( x, options, fcn, thisArg ) {
 		'dtype': opts.dtype
 	});
 
-	// Create a view on top of output ndarray having the same shape as the input ndarray:
+	// Create a view on top of the output ndarray having the same shape as the input ndarray:
 	st = ( xsh.length > 0 ) ? shape2strides( xsh, opts.order ) : [ 0 ];
-	view = ndarray( opts.dtype, getData( y ), xsh, st, 0, opts.order );
+	view = new ndarray( opts.dtype, getData( y ), xsh, st, 0, opts.order );
 
 	// Transform and assign elements to the output ndarray:
 	map( [ x, view ], cb, ctx );
+
 	return y;
 }